See here. '"Evernote’s core text editing experience was designed around a framework that was optimized for the platform you were typing on; the Windows editor was purpose-built for Windows, the Mac editor for the Mac platform, and so on. We had an early vision of mobile’s implications on productivity, and highly platform-specific development was the fastest way to address that mobile future, which arrived quicker than we’d even imagined. In the face of rapidly interconnected devices, this framework generally held together well, but it wasn’t completely seamless", the company explains.' Now it is supposed to be completely "seamless."
In my experience the "editing experience" was never that important, as I never used it for writing.